Last tested: March 2021
This is the number Looker uses to represent "unlimited results". You might see it in API results or the internal database, but you cannot enter it manually into the UI.
For allowed row limits, see https://help.looker.com/hc/en-us/articles/360001285567-What-are-all-the-Row-Limits-in-Looker-
This content is subject to limited support.